CN114113413A - Application of H-Beta type molecular sieve in NPs detection or adsorption and method for simultaneously detecting 8 NPs - Google Patents
Application of H-Beta type molecular sieve in NPs detection or adsorption and method for simultaneously detecting 8 NPs Download PDFInfo
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Abstract
The invention provides application of an H-Beta type molecular sieve in NPs detection or adsorption and a method for simultaneously detecting 8 NPs, and relates to the technical field of analysis and detection. According to the invention, the H-Beta type molecular sieve is used as an adsorbent of Neonicotinoid Pesticides (NPs) in the sample pretreatment process, so that the specific adsorption of the NPs in the sample can be realized, and the accuracy, precision and sensitivity of the detection of the NPs in water and honey are improved; the H-Beta type molecular sieve has high repeated utilization rate, and can meet the requirements of quick, accurate, economical and good repeatability in the pretreatment and detection of 8 NPs samples in a sample to be detected. And detecting by high performance liquid chromatography-tandem mass spectrometry. The method provided by the invention can realize the accurate detection of 8 trace NPs, the detection limit of the NPs in water is less than 0.1ng/mL, and the detection limit of the NPs in honey is less than 2.0 ng/g.
Description
Technical Field
The invention relates to the technical field of analysis and detection, in particular to application of an H-Beta type molecular sieve in NPs detection or adsorption and a method for simultaneously detecting 8 NPs.
Background
Neonicotinoid Pesticides (NPs) are the fourth major class of insecticides following organophosphorus, carbamate and pyrethroid insecticides, and the insecticidal mechanism is to act on nicotinic acetylcholine receptors (nAChRs) of postsynaptic membranes of insect nervous systems and nerves around them, so that the insects keep excited and paralyzed and die. The pesticide has the chemical biological characteristics of wide insecticidal spectrum, low dosage, good systemic conductivity, novel action mechanism, high environmental compatibility and the like, has no cross resistance with other traditional pesticides, and is the most widely used pesticide at present.
With the wide application of neonicotinoid pesticides in pest control of crops such as cereals, vegetables and fruits, the neonicotinoid pesticides are continuously detected in environmental media such as food, soil, underground water, rivers and the like, and great potential safety hazards are brought to human health and ecological environment. In view of this, countries and organizations in the world adopt certain limiting measures for the use of neonicotinoid insecticides, and meanwhile, research on methods for accurately and rapidly detecting neonicotinoid pesticide residues in agricultural products is receiving wide attention.
For example, millet has been disclosed as a pretreatment for neonicotinoid insecticides in honey by dissolving a honey sample in water, adding N-Propylethylenediamine (PSA) powder and acidic Al2O3Vortexing, centrifuging, collecting supernatant, and passing through membrane (see: chestnut, plum, qixin, et al. QuEChERS-high performance liquid chromatography/tandem mass spectrometry for simultaneous determination of 9 neonicotinoid pesticide residues in honey [ J)]The scientific journal of analysis 2015,31(2): 203-. However, N-propylethylenediamine Powder (PSA) and acidic Al are used2O3The sample treated as the adsorbent was not detected with sufficient accuracy by high performance liquid chromatography-tandem mass spectrometry (LC-MS/MS).
Disclosure of Invention
The invention aims to provide application of an H-Beta type molecular sieve in NPs detection or adsorption and a method for simultaneously detecting 8 NPs. The invention adopts the H-Beta type molecular sieve as the adsorbent of the neonicotinoid pesticides in the sample pretreatment process, and can realize the accurate quantitative detection of 8 neonicotinoid pesticides.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides application of an H-Beta type molecular sieve in detection or adsorption of neonicotinoid pesticides.
Preferably, the mole ratio of silicon to aluminum of the H-Beta type molecular sieve is 1-60.
Preferably, the H-Beta type molecular sieve is used as an adsorbent of neonicotinoid pesticides in the sample pretreatment process.
The invention provides a method for simultaneously detecting 8 neonicotinoid pesticides, which comprises the following steps:
carrying out vortex adsorption on a sample to be detected by using an H-Beta type molecular sieve to obtain a neonicotinoid pesticide adsorption sample;
carrying out liquid vortex ultrasonic desorption on the neonicotinoid pesticide adsorbing sample by using an ammonia water-acetonitrile mixed solution to obtain a neonicotinoid pesticide solution to be detected;
detecting the content of 8 neonicotinoid pesticides in the neonicotinoid pesticide liquid to be detected by adopting high performance liquid chromatography-tandem mass spectrometry;
the 8 neonicotinoid pesticides comprise acetamiprid, clothianidin, dinotefuran, flonicamid, imidacloprid, imidaclothiz, thiacloprid and thiamethoxam.
Preferably, the sample to be tested comprises water and/or honey.
Preferably, the mass ratio of the H-Beta type molecular sieve to the sample to be detected is 1: 10 to 1000.
Preferably, the temperature of vortex adsorption is 10-40 ℃, the rotating speed is 500-2000 r/min, and the time is 5-10 min.
Preferably, the mass fraction of ammonia in the ammonia water-acetonitrile mixed solution is 25-28%;
the volume fraction of the ammonia water in the ammonia water-acetonitrile mixed solution is 0.3-0.7%;
the mass ratio of the H-Beta type molecular sieve to the volume of the ammonia water-acetonitrile mixed solution is 1 g: 10-50 mL.
Preferably, the vortex ultrasonic desorption comprises: carrying out vortex desorption and ultrasonic desorption in sequence; the temperature of vortex desorption is 10-40 ℃, the rotating speed is 500-2000 r/min, and the time is 1-10 min; the temperature of ultrasonic desorption is 10-40 ℃, the ultrasonic power is 100-600W, and the time is 1-10 min.
Preferably, the detection conditions of high performance liquid chromatography in the high performance liquid chromatography-tandem mass spectrometry comprise: the mobile phase system comprises a mobile phase A and a mobile phase B, wherein the mobile phase A is methanol, and the mobile phase B is ammonium acetate-formic acid aqueous solution; the flow rate of the mobile phase system is 0.2-0.5 mL/min; the elution mode is gradient elution;
the procedure for the gradient elution was:
0.0-1.2 min, wherein the volume fraction of the mobile phase A is 5%;
1.2-4.5 min, wherein the volume fraction of the mobile phase A is increased from 5% to 95%;
4.5-6.0 min, wherein the volume fraction of the mobile phase A is 95%;
6.0-6.8 min, wherein the volume fraction of the mobile phase A is reduced from 95% to 5%;
6.8-8.0 min, wherein the volume fraction of the mobile phase A is 5%;
the detection conditions of the mass spectrum in the high performance liquid chromatography-tandem mass spectrum comprise: the ion source is an electrospray ionization source; the detection mode is a positive ion mode; the ionization voltage is 4000-5500V; the temperature of the ion source is 400-550 ℃; the air pressure of the air curtain is 20-30 psi, and the pressure of the spraying air is 40-50 psi; the auxiliary heating pressure is 40-50 psi; the pressure of the collision gas is 40-70 psi.
The invention provides application of an H-Beta type molecular sieve in detection or adsorption of neonicotinoid pesticides. According to the invention, the H-Beta type molecular sieve is used as the adsorbent of the neonicotinoid pesticide in the sample pretreatment process, so that the specific adsorption of the neonicotinoid pesticide in the sample can be realized, and the adsorption to a matrix is reduced, thereby improving the detection accuracy of the neonicotinoid pesticide in the sample to be detected (such as water and honey); the pretreatment steps are few and the operation is easy, so that the accuracy is improved; the sample concentration multiple is high, so that the sensitivity is improved; moreover, the H-Beta type molecular sieve has high recycling rate, and can meet the requirements of pretreatment and detection of 8 neonicotinoid pesticide samples in the samples to be detected, such as rapidness, accuracy, economy and good repeatability.
The invention provides a method for simultaneously detecting 8 neonicotinoid pesticides, which comprises the following steps: carrying out vortex adsorption on a sample to be detected by using an H-Beta type molecular sieve to obtain a neonicotinoid pesticide adsorption sample; carrying out liquid vortex ultrasonic desorption on the neonicotinoid pesticide adsorbing sample by using an ammonia water-acetonitrile mixed solution to obtain a neonicotinoid pesticide solution to be detected; detecting the content of 8 neonicotinoid pesticides in the neonicotinoid pesticide liquid to be detected by adopting high performance liquid chromatography-tandem mass spectrometry; the 8 neonicotinoid pesticides comprise acetamiprid, clothianidin, dinotefuran, flonicamid, imidacloprid, imidaclothiz, thiacloprid and thiamethoxam. According to the invention, the H-Beta type molecular sieve is used as an adsorbent of the neonicotinoid pesticide in the sample pretreatment process, the specific adsorption of the neonicotinoid pesticide in the sample can be realized, the ammonia water-acetonitrile mixed solution is used for desorbing the neonicotinoid pesticide adsorbed on the H-Beta type molecular sieve, the desorption effect can be improved by adding the ammonia water, and the detection is carried out by high performance liquid chromatography-tandem mass spectrometry. The method provided by the invention has high accuracy, accuracy and sensitivity, and can realize the accurate detection of 8 kinds of trace neonicotinoid pesticides in a sample to be detected; moreover, the H-Beta type molecular sieve has high recycling rate, and can meet the requirements of simple, quick, accurate, economical and good repeatability in pretreatment and detection of 8 neonicotinoid pesticide samples in samples to be detected. As shown in the example results, the detection limit of the neonicotinoid pesticides in the water is lower than 0.1ng/mL, and the detection limit of the neonicotinoid pesticides in the honey is lower than 2.0 ng/g. When the addition level of 8 neonicotinoid pesticides in water is 0.2ng/mL, the average recovery rate is 78.8-101.4%, and the RSD is 4.3-6.7%; when the addition level is 2ng/mL, the average recovery rate is 81.6-102.9%, and the RSD is 3.6-5.5%; when the addition level is 10ng/mL, the average recovery rate is 78.7-101.0%, and the RSD is 1.6-4.8%. When the addition level of 8 neonicotinoid pesticides in honey is 2ng/g, the average recovery rate is 70.9-106.5%, and the RSD is 1.3-7.8%; when the addition level is 10ng/g, the average recovery rate is 73.4-108.0%, and the RSD is 0.1-7.7%; when the addition level is 100ng/g, the average recovery rate is 76.1-108.4%, and the RSD is 0.5-6.8%. The H-Beta type molecular sieve can be repeatedly used for more than 10 times after being washed by acetonitrile.
Drawings
FIG. 1 is a flow chart of preparing and detecting a neonicotinoid agricultural chemical solution to be detected according to an embodiment of the invention.
Detailed Description
The invention provides application of an H-Beta type molecular sieve in detection or adsorption of neonicotinoid pesticides.
In the invention, the mole ratio of silicon to aluminum of the H-Beta type molecular sieve is preferably 1 to 60, more preferably 10 to 50, and even more preferably 20 to 40. In the invention, the H-Beta type molecular sieve is preferably used as an adsorbent of neonicotinoid pesticides in the sample pretreatment process.
In the present invention, the preparation method of the H-Beta type molecular sieve preferably comprises the following steps:
mixing sodium hydroxide, an aluminum source, tetraethyl ammonium hydroxide, a silicon source and water, carrying out hydrothermal synthesis reaction on the obtained gel, and then calcining for the first time to obtain a Beta-type molecular sieve;
and mixing the Beta type molecular sieve with an ammonium salt aqueous solution, carrying out ion exchange, and then carrying out secondary calcination to obtain the H-Beta type molecular sieve.
According to the invention, sodium hydroxide, an aluminum source, tetraethyl ammonium hydroxide, a silicon source and water are mixed, and the obtained gel is subjected to hydrothermal synthesis reaction and then is subjected to first calcination to obtain the Beta-type molecular sieve.
In the present invention, unless otherwise specified, the reagents used are commercially available products well known to those skilled in the art.
In the present invention, the aluminum source preferably comprises NaAlO2And/or Al2(SO4)3More preferably NaAlO2. In the invention, the silicon source preferably comprises one or more of silica gel powder, white carbon black and coarse-pore silica gel. In the present invention, the aluminum source is Al2O3Meter, the silicon source SiO2Calculated as Na, sodium hydroxide2O, in said gel, Al2O3And Na2The molar ratio of O is preferably 1:2-10, more preferably 1: 3-5; the Al is2O3The molar ratio to tetraethylammonium hydroxide is preferably 1: 5-15, more preferably 1: 6-9; the Al is2O3With SiO2Is preferably 1: 2-120, more preferably 1: 10 to 100, and more preferably 1: 35-50; the Al is2O3And H2The molar ratio of O is preferably 1: 12-50, more preferably 1: 16 to 20.
In a specific embodiment of the present invention, the sodium hydroxide, the aluminum source, the tetraethyl ammonium hydroxide, the silicon source and the water are preferably mixed by dissolving the sodium hydroxide, the aluminum source and the tetraethyl ammonium hydroxide in the water, adding the silicon source under stirring, and then continuing stirring; the stirring speed is not specially limited, and the raw materials can be uniformly mixed; the time for continuing stirring is preferably 2-6 h, and more preferably 2 h.
In the invention, the temperature of the hydrothermal synthesis reaction is 140-160 ℃, and more preferably 145 ℃; the time of the hydrothermal synthesis is preferably 36-60 hours, and more preferably 48 hours.
After the hydrothermal synthesis reaction, the method preferably further comprises the steps of cooling the reaction liquid obtained by the hydrothermal synthesis to room temperature, carrying out solid-liquid separation, washing the obtained solid product, and drying to obtain the Beta-type molecular sieve precursor. The cooling method of the present invention is not particularly limited, and a cooling method known to those skilled in the art may be used, specifically, natural cooling. The solid-liquid separation method is not particularly limited, and a solid-liquid separation method known to those skilled in the art, such as filtration or suction filtration, may be used. In the present invention, the water for washing preferably includes deionized water and/or distilled water. In the invention, the drying temperature is preferably 80-120 ℃, and more preferably 100 ℃; the time of the hydrothermal synthesis is preferably 10-14 h, and more preferably 12 h.
In the present invention, the temperature of the first calcination is preferably 500600 ℃, more preferably 550 ℃; the time of the first calcination is preferably 5-8 h, and more preferably 6 h. In the present invention, the purpose of the first calcination is to remove tetraethylammonium hydroxide (templating agent).
After the Beta type molecular sieve is obtained, the Beta type molecular sieve is mixed with an ammonium salt aqueous solution, and the mixture is subjected to ion exchange and then is subjected to secondary calcination to obtain the H-Beta type molecular sieve.
In the invention, the concentration of the ammonium salt aqueous solution is preferably 0.5-2 mol/L, and more preferably 1 mol/L. In the present invention, the ratio of the mass of the Beta-type molecular sieve to the volume of the ammonium salt aqueous solution (solid-to-liquid ratio) is preferably 1 g: 40-60 mL, more preferably 1 g: 50 mL. The mixing method of the present invention is not particularly limited, and the raw materials can be uniformly mixed by a mixing method known to those skilled in the art, specifically, stirring and mixing.
In the invention, the temperature of the ion exchange reaction is 80-90 ℃, and more preferably 85 ℃; the time of the ion exchange reaction is preferably 1-3 h, and more preferably 2 h; and in the ion exchange reaction process, the ammonium radical exchanges sodium ions out of the Beta type molecular sieve.
In the invention, the temperature of the second calcination is preferably 500-600 ℃, and more preferably 550 ℃; the second calcination time is preferably 6-9 h, and more preferably 6 h. In the present invention, the purpose of the second calcination is to decompose ammonium ions, thereby obtaining an H-Beta type molecular sieve.
The invention provides a method for simultaneously detecting 8 neonicotinoid pesticides, which comprises the following steps:
carrying out vortex adsorption on a sample to be detected by using an H-Beta type molecular sieve to obtain a neonicotinoid pesticide adsorption sample;
carrying out liquid vortex ultrasonic desorption on the neonicotinoid pesticide adsorbing sample by using an ammonia water-acetonitrile mixed solution to obtain a neonicotinoid pesticide solution to be detected;
detecting the content of 8 neonicotinoid pesticides in the neonicotinoid pesticide liquid to be detected by adopting liquid chromatography-tandem mass spectrometry;
the 8 neonicotinoid pesticides comprise acetamiprid, clothianidin, dinotefuran, flonicamid, imidacloprid, imidaclothiz, thiacloprid and thiamethoxam.
The method utilizes the H-Beta type molecular sieve to carry out vortex adsorption on the sample to be detected, so as to obtain the neonicotinoid pesticide adsorption sample.
In the present invention, the sample to be tested preferably comprises water and/or honey; when the sample to be detected is honey, the honey is preferably used in the form of a honey water solution, and the mass fraction of the honey in the honey water solution is preferably 1-50%, and more preferably 5-15%. In the invention, the concentration of the neonicotinoid pesticide in the sample to be detected is preferably 0.01-1000 ng/g, and more preferably 0.1-100 ng/g. In the invention, the mass ratio of the H-Beta type molecular sieve to the sample to be detected is preferably 1: 10-1000, more preferably 1: 50 to 800, and more preferably 1: 100 to 500.
In the invention, the temperature of the vortex adsorption is preferably 10-40 ℃, and more preferably 20-30 ℃; the rotation speed of the vortex adsorption is preferably 500-2000 r/min, and more preferably 1000-1500 r/min; the vortex adsorption time is preferably 5-10 min, and more preferably 7-8 min; the vortex adsorption is preferably carried out using a MX-F vortex mixer (Dragonlab, China). After the vortex adsorption, the invention preferably further comprises the step of carrying out centrifugal separation on the adsorption liquid obtained by the vortex adsorption, wherein the obtained solid component is a sample for adsorbing the neonicotinoid pesticide. In the present invention, the temperature of the centrifugation is preferably room temperature; the centrifugal separation speed is preferably 1000-6000 rpm, and more preferably 5000 rpm; the time for centrifugal separation is preferably 1-9 min, and more preferably 3 min; the centrifugation is preferably carried out in a 5415D centrifuge (Eppendorf Co., USA).
After the neonicotinoid pesticide sample is obtained, the neonicotinoid pesticide sample is subjected to liquid vortex ultrasonic desorption by using an ammonia water-acetonitrile mixed solution to obtain the neonicotinoid pesticide liquid to be detected.
In the invention, NH in the ammonia water-acetonitrile mixed solution3The mass fraction of (b) is preferably 25 to 28%, more preferably 26 to 27%; the volume fraction of the ammonia water in the ammonia water-acetonitrile mixed solution is preferably 0.3-0.7%, more preferably 0.4-0.6%, and further preferably 0.5%; the ratio of the mass of the H-Beta type molecular sieve to the volume of the ammonia water-acetonitrile mixed solution is preferably 1 g: 10-50 mL of the total amount of the active ingredient,more preferably 1 g: 20-40 mL, more preferably 1 g: 30 mL.
In the present invention, the vortex ultrasonic desorption preferably comprises vortex desorption and ultrasonic desorption which are sequentially performed; the temperature of vortex desorption is preferably 10-40 ℃, and more preferably 20-30 ℃; the rotation speed of vortex desorption is preferably 500-2000 r/min, and more preferably 1000-1500 r/min; the vortex desorption time is preferably 1-10 min, and more preferably 3-5 min; the vortex desorption is preferably carried out using a MX-F vortex mixer (Dragonlab, China); the temperature of ultrasonic desorption is preferably 10-40 ℃, and more preferably 20-30 ℃; the ultrasonic power of ultrasonic desorption is preferably 100-600W, more preferably 200-500W, and further preferably 300-400W; the time of ultrasonic desorption is preferably 1-10 min, more preferably 3-5 min, and the ultrasonic desorption is preferably performed by using an ultrasonic cleaner (Shanghai science ultrasonic instruments, Inc., China). After the vortex ultrasonic desorption, the invention preferably further comprises the steps of carrying out centrifugal separation on the desorption liquid obtained by the vortex ultrasonic desorption, and passing the obtained supernatant through a membrane to obtain the neonicotinoid pesticide liquid to be detected. In the present invention, the temperature of the centrifugation is preferably room temperature; the centrifugal separation speed is preferably 1000-6000 rpm, and more preferably 3000-5000 rpm; the time for centrifugal separation is preferably 1-5 min, and more preferably 3-4 min; the centrifugation is preferably carried out in a 5415D centrifuge (Eppendorf Co., USA). In the present invention, the filtration membrane is preferably a 0.22 μm filtration membrane; the filtration is preferably carried out using a 0.22 μm nylon filter (Shanghai spectral, China).
After the neonicotinoid pesticide liquid to be detected is obtained, the content of 8 neonicotinoid pesticides in the neonicotinoid pesticide liquid to be detected is detected by adopting liquid chromatography-tandem mass spectrometry.
In the invention, the 8 neonicotinoid pesticides comprise acetamiprid, clothianidin, dinotefuran, flonicamid, imidacloprid, imidaclothiz, thiacloprid and thiamethoxam.
In the present invention, the detection by ultra performance liquid chromatography tandem mass spectrometry preferably comprises the following steps:
performing liquid chromatography-tandem mass spectrometry (LC-MS/MS) detection on the neonicotinoid pesticide liquid to be detected to obtain a sample chromatogram;
respectively obtaining peak areas of 8 neonicotinoid pesticides in the sample according to the sample chromatogram; respectively calculating the content of 8 neonicotinoid pesticides in the neonicotinoid pesticide liquid to be detected according to the peak area and the linear curve; the linear curve is a linear curve of chromatographic peak area-concentration of each of 8 kinds of neonicotinoid pesticides; the 8 neonicotinoid pesticides comprise acetamiprid, clothianidin, dinotefuran, flonicamid, imidacloprid, imidaclothiz, thiacloprid and thiamethoxam.
The invention carries out liquid chromatography-tandem mass spectrometry (LC-MS/MS) detection on the neonicotinoid pesticide liquid to be detected to obtain a sample chromatogram.
In the present invention, the detection conditions of liquid chromatography in the liquid chromatography-tandem mass spectrometry preferably include: the column is preferably a WatersACQUITY UPLC HSS T3 column (100X 2.1mm, 1.8 μm, Waters Corp.); the column temperature is preferably 45 ℃; the mobile phase system is preferably a mobile phase A and a mobile phase B, wherein the mobile phase A is methanol; the mobile phase B is preferably an ammonium acetate-formic acid aqueous solution, the concentration of ammonium acetate in the ammonium acetate-formic acid aqueous solution is preferably 1-20 mmol/L, more preferably 10mmol/L, and the volume concentration of formic acid in the ammonium acetate-formic acid aqueous solution is preferably 0.05-0.5%, more preferably 0.1%; the flow rate of the mobile phase system is preferably 0.2-0.5 mL/min, and more preferably 0.4 mL/min; the sampling amount is preferably 2-8 mu L, and more preferably 5 mu L; the elution mode is preferably gradient elution; the procedure of the gradient elution is preferably:
0.0-1.2 min, wherein the volume fraction of the mobile phase A is preferably 5%;
1.2-4.5 min, wherein the volume fraction of the mobile phase A is preferably 95%;
4.5-6.0 min, wherein the volume fraction of the mobile phase A is preferably 95%;
6.0-6.8 min, wherein the volume fraction of the mobile phase A is preferably 5%;
6.8-8.0 min, and the volume fraction of the mobile phase A is preferably 5%.
In the present invention, the HPLC detection apparatus is preferably a HPLC chromatograph (Waters corporation, Waters, H-Class).
In the present invention, the detection conditions of mass spectrum in the hplc-tandem mass spectrum preferably include: the ion source is an electrospray ionization source (ESI); the detection mode is a positive ion mode; the ionization voltage (IS) IS 4000-5500V, and IS more preferably 5500V; the ion source temperature is preferably 400-550 ℃, and more preferably 450-500 ℃; the air curtain gas (CUR) is preferably air, the pressure of the air curtain gas is preferably 20-30 psi and more preferably 25psi, the spray gas (GS1) is preferably air, and the pressure of the spray gas is preferably 40-50 psi and more preferably 45 psi; the auxiliary heating gas (GS2) is preferably air, and the pressure of the auxiliary heating gas is preferably 40-50 psi, more preferably 45 psi; the collision gas (CAD) is preferably nitrogen, and the collision gas pressure is preferably 40-70 psi, more preferably 50-60 psi; the mass spectrum Multiple Reaction Monitoring (MRM) parameters of the neonicotinoid pesticides are preferably as shown in table 1:
TABLE 1 MRM parameters of neonicotinoid pesticides
In the present invention, the mass spectrometric detection is preferably performed by Triple quadrupole mass spectrometry (AB SCIEX Triple Quad4500, Waters).
After a sample chromatogram is obtained, respectively obtaining peak areas of 8 neonicotinoid pesticides in the sample according to the sample chromatogram; respectively calculating the content of 8 neonicotinoid pesticides in the neonicotinoid pesticide liquid to be detected according to the peak area and the linear curve; the linear curve is a linear curve of chromatographic peak area-concentration of each of 8 kinds of neonicotinoid pesticides; the 8 neonicotinoid pesticides comprise acetamiprid, clothianidin, dinotefuran, flonicamid, imidacloprid, imidaclothiz, thiacloprid and thiamethoxam.
In the present invention, the preparation method of the linear curve preferably includes the steps of:
preparing a series of reference substance mixed standard liquid containing 8 neonicotinoid pesticide reference substances; the 8 neonicotinoid pesticide reference substances comprise an acetamiprid reference substance, a clothianidin reference substance, a dinotefuran reference substance, a flonicamid reference substance, an imidacloprid reference substance, a imidaclothiz reference substance, a thiacloprid reference substance and thiamethoxam;
performing LC-MS/MS detection on the series of reference substance mixed standard solutions to obtain chromatographic peak areas of 8 neonicotinoid pesticides, and performing linear fitting on the chromatographic peak areas and the concentrations to obtain a linear curve.
The invention prepares a series of reference substance mixed standard liquid containing 8 neonicotinoid pesticide reference substances. In the present invention, the preparation method of the series of reference substance mixed standard solutions containing 8 neonicotinoid pesticide reference substances preferably comprises the following steps: respectively dissolving 8 neonicotinoid pesticide reference substances in acetonitrile to obtain 8 reference substance stock solutions, wherein the concentration of the reference substance stock solutions is preferably 100mg/L, and the 8 neonicotinoid pesticide reference substances comprise an acetamiprid reference substance, a clothianidin reference substance, a dinotefuran reference substance, a flonicamid reference substance, an imidacloprid reference substance, a imidaclothiz reference substance, a thiacloprid reference substance and a thiamethoxam reference substance; accurately transferring 0.1mL of each of 8 reference substance stock solutions into a volumetric flask, and accurately metering the volume to 10mL by using acetonitrile to obtain a reference substance mixed standard solution; the concentration of 8 reference substances in the reference substance mixed standard solution is 1 mg/L; the control mixed standard solution was diluted with 0.5 wt% ammonia-acetonitrile mixed solution to obtain series of control mixed standard curves with concentrations of 2.0ng/mL, 5.0ng/mL, 10.0ng/mL, 20.0ng/mL, 50.0ng/mL and 200.0ng/mL, respectively.
In the embodiment of the present invention, the 8 neonicotinoid pesticide control products are preferably purchased from Tianjin Altar science and technology, Inc. in China.
Obtaining a series of reference substance mixed standard liquid, performing LC-MS/MS detection on the series of reference substance mixed standard liquid to obtain chromatographic peak areas of 8 kinds of neonicotinoid pesticides, and performing linear fitting on the chromatographic peak areas and the concentrations to obtain a linear curve. In the present invention, the linear curve is preferably obtained by performing linear regression on the mass concentration (X, ng/mL) of the sample to be measured with the peak area (Y) of the series of control mixed standard solutions, and drawing a standard curve to obtain a linear regression equation and correlation coefficients, with the results shown in table 2:
TABLE 2 Linear regression equation and correlation coefficient for neonicotinoid pesticides
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the examples of the present invention, LC-MS/MS detection was carried out by using high performance liquid chromatography (Waters acquisition H-Class, Waters corporation, USA) Triple quadrupole mass spectrometer (AB SCIEX Triple Quad4500, AB SCIEX corporation, USA). Vortex adsorption and vortex desorption were carried out using a MX-F vortex mixer (Dragonlab, China). Centrifugation was carried out using a 5415D centrifuge (Eppendorf Co., USA). The water is first-grade water and is prepared by a Milli-Q water purification system (Millipore company, USA); the filtration membrane used was a 0.22 μm nylon filter (Shanghai' an Spectrum, China).
Acetamiprid control, clothianidin control, dinotefuran control, flonicamid control, imidacloprid control, imidaclothiz control, thiacloprid control, and thiamethoxam control were purchased from Tianjin Alta technologies, Inc., China. Acetonitrile, methanol were chromatographically pure and purchased from merck, usa. Formic acid, ammonia and ammonium acetate were chromatographically pure grades, purchased from anderon corporation.
Example 1
0.916g of NaOH and 1.808g of NaAlO2And 33.975g of tetraethyl hydrogenThe amine oxide is dissolved in 42.725g H2And adding 23.0g of silica gel powder into the mixture under stirring, stirring for 2h, transferring the mixture into a polytetrafluoroethylene-lined stainless steel autoclave, carrying out hydrothermal reaction for 48h at 145 ℃, cooling to room temperature, filtering, washing the obtained solid product with deionized water, drying for 12h at 100 ℃, and calcining for 6h at 550 ℃ to obtain the Beta-type molecular sieve. Placing Beta type molecular sieve in 1mol/LNH4Ion exchange is carried out for 2H at 85 ℃ in Cl aqueous solution, the obtained ion exchange product is calcined for 6H at 550 ℃ to obtain the H-Beta type molecular sieve (the mole ratio of silicon to aluminum is 36), wherein the Beta type molecular sieve and NH4The solid-to-liquid ratio of the Cl aqueous solution is 1 g: 50 mL.
Example 2
(1) Preparation of series reference substance mixed standard liquid
Respectively dissolving 8 neonicotinoid pesticide reference substances in acetonitrile to obtain 8 reference substance stock solutions, wherein the concentration of the reference substance stock solutions is preferably 100mg/L, and the 8 neonicotinoid pesticide reference substances comprise an acetamiprid reference substance, a clothianidin reference substance, a dinotefuran reference substance, a flonicamid reference substance, an imidacloprid reference substance, a imidaclothiz reference substance, a thiacloprid reference substance and a thiamethoxam reference substance;
accurately transferring 1mL of each of 8 reference substance stock solutions into a volumetric flask, and accurately metering the volume to 10mL by using acetonitrile to obtain a reference substance mixed standard solution; the concentration of 8 reference substances in the reference substance mixed standard solution is 10 mg/L;
and diluting the reference substance mixed standard solution by using 0.5 wt% ammonia water-acetonitrile mixed solution to obtain series of reference substance mixed standard solutions with the concentrations of 2.0ng/mL, 5.0ng/mL, 10.0ng/mL, 20.0ng/mL, 50.0ng/mL and 200.0ng/mL respectively.
(2) Detection process
The detection of neonicotinoid pesticides in a sample was carried out using the flow chart shown in fig. 1.
Placing 40mL of series reference substance mixed standard solution into a 50mL plastic centrifuge tube, adding 50mg of the H-Beta type molecular sieve prepared in the example 1, sealing, performing vortex adsorption for 7min, centrifuging at room temperature and 5000rpm for 3min, discarding all supernatant, adding 2mL of 0.5% ammonia water-acetonitrile solution into the obtained neonicotinoid pesticide adsorbing sample, performing vortex adsorption for 1min, performing ultrasonic treatment at room temperature and 600W for 1min, centrifuging at 5000rpm for 3min, filtering the obtained supernatant with a 0.22 mu m nylon filter, and performing LC-MS/MS detection on the obtained neonicotinoid pesticide liquid to be detected. Wherein, the volume concentration of the ammonia water in the ammonia water-acetonitrile solution is 0.5 percent, and the concentration of the ammonia in the ammonia water is 27 percent by weight.
Conditions for high performance Liquid Chromatography (LC) detection: the column was a WatersACQUITYLC HSS T3 column (100X 2.1mm, 1.8 μm, Waters Corp.); the column temperature was 45 ℃; the sample injection amount is 5 mu L; the mobile phase system comprises a mobile phase A and a mobile phase B, wherein the mobile phase A is methanol; the mobile phase B is ammonium acetate-formic acid aqueous solution (the concentration of ammonium acetate is 10mmol/L, and the volume concentration of formic acid is 0.1%); the flow rate of the mobile phase system is 0.4 mL/min; the elution mode is gradient elution;
the total volume fraction of the mobile phase A and the mobile phase B in the gradient elution process is 100%, and the gradient elution program is specifically as follows:
0.0-1.2 min, wherein the volume fraction of the mobile phase A is 5%;
1.2-4.5 min, wherein the volume fraction of the mobile phase A is 95%;
4.5-6.0 min, wherein the volume fraction of the mobile phase A is 95%;
6.0-6.8 min, wherein the volume fraction of the mobile phase A is 5%;
6.8-8.0 min, wherein the volume fraction of the mobile phase A is 5%.
Conditions for mass spectrometry (MS/MS) detection: the ion source is an electrospray ionization source (ESI) and adopts a positive ion mode; the ionization voltage (IS) IS 5500V; the ion source Temperature (TEM) was 550 ℃; the air curtain air (CUR) is air, and the pressure is 30 psi; the spray gas (GS1) is air, and the pressure is 50 psi; the auxiliary heating gas (GS2) is air, and the pressure is 50 psi; the collision gas (CAD) is nitrogen, and the pressure is 7 psi; the MRM parameters are shown in table 1.
Performing LC-MS/MS detection in sequence from small to large according to concentration in the LC-MS/MS detection process to obtain peak areas of series reference substance mixed standard solutions of 8 neonicotinoid pesticides with corresponding concentrations, performing linear regression on the mass concentration (X, ng/mL) of a sample to be detected by using the peak area (Y) of the sample to be detected, drawing a standard curve to obtain a linear regression equation and a correlation coefficient, and calculating the detection limit of the 8 neonicotinoid pesticides by using a signal-to-noise ratio (S/N) as 3, wherein the result is shown in Table 2:
TABLE 28 Linear regression equation, Linear Range, and correlation coefficient R of neonicotinoid pesticides2Lower limit of detection and lower limit of quantification
As can be seen from Table 2, the detection method provided by the present invention has a low detection limit and high sensitivity.
Example 3
Test of recovery of neonicotinoid pesticides in water
Respectively adding an acetamiprid reference substance, a clothianidin reference substance, a dinotefuran reference substance, a flonicamid reference substance, an imidacloprid reference substance, a imidaclothiz reference substance, a thiacloprid reference substance and a thiamethoxam reference substance into water to prepare aqueous solutions with the concentrations of 0.2ng/mL, 2ng/mL and 10ng/mL respectively; respectively putting 40mL of aqueous solution into 50mL of plastic centrifuge tubes, adding 50mg of the H-Beta type molecular sieve prepared in the example 1, sealing, performing vortex adsorption for 7min, centrifuging at room temperature and 5000rpm for 3min, discarding all supernatant, adding 2mL of 0.5% ammonia-acetonitrile-containing solution, performing vortex adsorption for 1min, performing ultrasonic treatment for 1min at room temperature and 600W, centrifuging at 5000rpm for 3min, filtering the obtained supernatant with a 0.22 mu m nylon filter, and performing LC-MS/MS detection on the obtained neonicotinoid pesticide aqueous solution to be detected according to LC-MS/MS detection conditions in the example 2. Wherein, the volume concentration of the ammonia water in the ammonia water-acetonitrile solution is 0.5 percent, and the concentration of the ammonia in the ammonia water is 27 percent. The results of standard addition recovery experiments of 8 neonicotinoid pesticides in the aqueous solution of the neonicotinoid pesticides to be tested are shown in table 3 for 6 parallel measurements per level:
TABLE 3 recovery test results of 8 neonicotinoid pesticides in aqueous solution to be tested
As can be seen from Table 3, when the addition level of 8 neonicotinoid pesticides in water is 0.2ng/mL, the average recovery rate is 78.8-101.4%, and the RSD is 4.3-6.7%; when the addition level is 2ng/mL, the average recovery rate is 81.6-102.9%, and the RSD is 3.6-5.5%; when the addition level is 10ng/mL, the average recovery rate is 78.7-101.0%, and the RSD is 1.6-4.8%, which shows that the method provided by the invention has high detection accuracy and precision on 8 neonicotinoid pesticides in water.
Example 4
Test of recovery of neonicotinoid pesticides in honey
Dissolving 2g of honey in 40mL of water, adding an acetamiprid reference substance, a clothianidin reference substance, a dinotefuran reference substance, a flonicamid reference substance, an imidacloprid reference substance, a thiacloprid reference substance and a thiamethoxam reference substance to prepare a honey water solution with the concentrations of the neonicotinoid pesticide of 2.0ng/g, 10.0ng/g and 100.0ng/g respectively; respectively putting 40mL of honey aqueous solution into 50mL of plastic centrifuge tubes, adding 50mg of the H-Beta type molecular sieve prepared in the example 1, sealing, performing vortex adsorption for 7min, centrifuging at room temperature and 5000rpm for 3min, discarding all supernatant, adding 2mL of 0.5% ammonia-acetonitrile solution, performing vortex adsorption for 1min, performing ultrasonic treatment for 1min at room temperature and 600W, centrifuging at 5000rpm for 3min, filtering the obtained supernatant with a 0.22 mu m nylon filter, and performing LC-MS/MS detection on the obtained neonicotinoid pesticide honey aqueous solution to be detected according to LC-MS/MS detection conditions in the example 2. Wherein, the volume concentration of the ammonia water in the ammonia water-acetonitrile solution is 0.5 percent, and the concentration of the ammonia in the ammonia water is 27 percent by weight. The results of the standard addition recovery experiment of 8 neonicotinoid pesticides in the honey aqueous solution to be tested are shown in table 4 after 6 parallel measurements of each level:
TABLE 4 recovery test results of 8 neonicotinoid pesticides in honey aqueous solution to be tested
As can be seen from Table 4, when the addition level of 8 neonicotinoid pesticides in honey is 2ng/g, the average recovery rate is 70.9-106.5%, and the RSD is 1.3-7.8%; when the addition level is 10ng/g, the average recovery rate is 73.4-108.0%, and the RSD is 0.1-7.7%; when the addition level is 100ng/g, the average recovery rate is 76.1-108.4%, and the RSD is 0.5-6.8%, which shows that the method provided by the invention has high detection accuracy and precision on 8 neonicotinoid pesticides in honey.
Example 5
2mL of acetonitrile was added to a 50mL centrifuge tube containing 50mg of the H-Beta type molecular sieve used in example 3, vortexed for 1min, then sonicated for 1min at 600W at room temperature, and then centrifuged for 3min at 5000rpm, the whole supernatant was discarded, and the resulting recovered H-Beta type molecular sieve was placed in a fume hood to be dried, and the recovery rate of neonicotinoid type pesticides was measured by the method of example 4 (addition level: 2.0 ng/g). The recycling properties of the H-Beta type molecular sieve are shown in Table 5:
TABLE 5 recycle Performance of H-Beta type molecular sieves
As can be seen from Table 5, the H-Beta type molecular sieve can be reused for more than 10 times after being cleaned by 2mL of acetonitrile, the recovery rate is still 71-95%, and the reuse rate of the H-Beta type molecular sieve is high.
Example 6
Purchasing 10 batches of bottled water from a supermarket to detect the neonicotinoid pesticides, measuring 40mL of each sample, placing the sample into a 50mL plastic centrifuge tube, adding 50mg of the H-Beta type molecular sieve prepared in the example 1, sealing, performing vortex adsorption for 7min, centrifuging at room temperature and 5000rpm for 3min, discarding all supernatant, adding 2mL of 0.5% ammonia-acetonitrile solution, performing vortex for 1min, performing ultrasonic treatment at room temperature and 600W for 1min, centrifuging at 5000rpm for 3min, filtering the obtained supernatant with a 0.22 mu m nylon filter, and performing LC-MS/MS detection on the obtained neonicotinoid pesticide aqueous solution to be detected according to the LC-MS/MS detection conditions in the example 2. The content of 8 neonicotinoid pesticides is lower than the detection limit of the method.
Example 7
Purchasing 24 batches of honey from a supermarket to detect neonicotinoid pesticides, weighing 2g of each honey sample, dissolving the 2g of honey sample in 40mL of water, placing 40mL of honey aqueous solution in a 50mL plastic centrifuge tube, adding 50mg of the H-Beta type molecular sieve prepared in example 1, sealing, performing vortex adsorption for 7min, centrifuging at room temperature and 5000rpm for 3min, discarding all supernatant, adding 2mL of ammonia-acetonitrile solution containing 0.5% of ammonia water, performing vortex for 1min, performing ultrasonic treatment at room temperature and 600W for 1min, centrifuging at 5000rpm for 3min, filtering the obtained supernatant with a nylon filter membrane of 0.22 mu m, and performing LC-MS/MS detection on the obtained neonicotinoid pesticide honey aqueous solution to be detected according to LC-MS/MS detection conditions in example 2. Detecting acetamiprid for 5 times, wherein the content range is 1.4-9.4 ng/g; imidacloprid is detected for 3 times, and the content range is 1.0-4.8 ng/g; thiamethoxam is detected for 1 time, and the content is 1.8 ng/g; the content of other neonicotinoid pesticides is lower than the detection limit of the method.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
- The application of the H-Beta type molecular sieve in the detection or adsorption of neonicotinoid pesticides.
- 2. The use according to claim 1, wherein the H-Beta type molecular sieve has a Si/Al molar ratio of 1 to 60.
- 3. Use according to claim 1 or 2, characterized in that the molecular sieve of the H-Beta type is used as an adsorbent for neonicotinoid pesticides during sample pre-treatment.
- 4. A method for simultaneously detecting 8 neonicotinoid pesticides comprises the following steps:carrying out vortex adsorption on a sample to be detected by using an H-Beta type molecular sieve to obtain a neonicotinoid pesticide adsorption sample;carrying out liquid vortex ultrasonic desorption on the neonicotinoid pesticide adsorbing sample by using an ammonia water-acetonitrile mixed solution to obtain a neonicotinoid pesticide solution to be detected;detecting the content of 8 neonicotinoid pesticides in the neonicotinoid pesticide liquid to be detected by adopting high performance liquid chromatography-tandem mass spectrometry;the 8 neonicotinoid pesticides comprise acetamiprid, clothianidin, dinotefuran, flonicamid, imidacloprid, imidaclothiz, thiacloprid and thiamethoxam.
- 5. The method of claim 4, wherein the sample to be tested comprises water and/or honey.
- 6. The method according to claim 4 or 5, wherein the mass ratio of the H-Beta type molecular sieve to the sample to be tested is 1: 10 to 1000.
- 7. The method according to claim 4 or 5, wherein the temperature of the vortex adsorption is 10-40 ℃, the rotating speed is 500-2000 r/min, and the time is 5-10 min.
- 8. The method according to claim 4, wherein the mass fraction of ammonia in the ammonia-acetonitrile mixed solution is 25-28%;the volume fraction of the ammonia water in the ammonia water-acetonitrile mixed solution is 0.3-0.7%;the mass ratio of the H-Beta type molecular sieve to the volume of the ammonia water-acetonitrile mixed solution is 1 g: 10-50 mL.
- 9. The method of claim 4, wherein the vortex ultrasonic desorption comprises: carrying out vortex desorption and ultrasonic desorption in sequence; the temperature of vortex desorption is 10-40 ℃, the rotating speed is 500-2000 r/min, and the time is 1-10 min; the temperature of ultrasonic desorption is 10-40 ℃, the ultrasonic power is 100-600W, and the time is 1-10 min.
- 10. The method according to claim 4, wherein the detection conditions of high performance liquid chromatography in high performance liquid chromatography-tandem mass spectrometry comprise: the mobile phase system comprises a mobile phase A and a mobile phase B, wherein the mobile phase A is methanol, and the mobile phase B is ammonium acetate-formic acid aqueous solution; the flow rate of the mobile phase system is 0.2-0.5 mL/min; the elution mode is gradient elution;the procedure for the gradient elution was:0.0-1.2 min, wherein the volume fraction of the mobile phase A is 5%;1.2-4.5 min, wherein the volume fraction of the mobile phase A is increased from 5% to 95%;4.5-6.0 min, wherein the volume fraction of the mobile phase A is 95%;6.0-6.8 min, wherein the volume fraction of the mobile phase A is reduced from 95% to 5%;6.8-8.0 min, wherein the volume fraction of the mobile phase A is 5%;the detection conditions of the mass spectrum in the high performance liquid chromatography-tandem mass spectrum comprise: the ion source is an electrospray ionization source; the detection mode is a positive ion mode; the ionization voltage is 4000-5500V; the temperature of the ion source is 400-550 ℃; the air pressure of the air curtain is 20-30 psi, and the pressure of the spraying air is 40-50 psi; the auxiliary heating pressure is 40-50 psi; the pressure of the collision gas is 40-70 psi.
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